Changes to List Node Windows

added the optional property windows/items/oneOf[subschema #2: AgentKnowledgeNodeWindowResponse]/nodes/items/oneOf[subschema #2: AgentKnowledgeFileWindowNodeResponse]/sourceSessions to the response with the 200 status

added the new optional query request parameter include_hidden

added the required property windows/items/oneOf[subschema #2: AgentKnowledgeNodeWindowResponse]/nodes/items/oneOf[subschema #2: AgentKnowledgeFileWindowNodeResponse]/isUserVisible to the response with the 200 status